This work is pure netorase. Kana the main heroine is loyal and doesn't betrays her boyfriend Ryo.
Titled netorase But it's borderline netorare where the one in control is the GF, not the bull. Ryo started suffering from ED, which basically hurt his ego as a man, and he decided to do the lending test he found online. He found a bull from a list, and even put a "no raw sex" rule in place. He even asked the boyfriend to call them right then and there if he didn't want them doing raw sex. The BF rushes to call them to stop it, but then his GF Kana teleports right behind the BF (pssh... nothing personnel, kid). What's going on? Well, turns out she lied and never did online streams as they agreed—everything was pre-recorded and sent to the BF for a whole week. That's why the faceless bull never got a call. Kana also tricked him into believing Ryo was okay with raw sex because he didn't get the call to stop them. The rules were meaningless, and she did it raw with the bull for a whole week. The GF pulled a 180° on her character and started humiliating Ryo as she made him watch her videos of having raw sex with the bull while she gave him a handjob. He got a hard-on and subsequently ejaculated properly for once while feeling humiliated. Time skip months later: their relationship didn't break despite the odds. Both stayed together and even started living under the same roof. Ryo's body has recovered; his Johnny is working as it should. However, he ended up kinda mind-broken, as he gets the hardest when watching the videos from months ago. Kana catches him and teases him, asking if he wants to do it again as he ponders what he should do at the end.